You have more shoulder exercises then leg exercises. 
I think Tony & Phate have already given great advice to you.
Looking at the routine right now - there is still not enough leg work, still not enough full body compound movements (squats, deadlifts, lunges, cleans, etc.). You build strength & muscle from these exercises. Period. I'm not sure why you seem focused on doing body part splits. You seem like an ideal person for FBWs.
There are variations of each of these that can be done with dumbbells. It might not seem as "good" as doing bar work to you, but in some ways, it is actually better. There is a reason that we can't lift as much using DBs as we can using the bar - it's because the DBs present your body with a different kind of challenge.
This is a great site for finding lots of variations for each type of movement (bar, db, cable, bodyweight, etc.):
Weight Training, Exercise Instruction & Kinesiology
Good luck!
Firstly those of you saying i dont have enough leg work... my legs r in pain for 4 days after that workout.
After 6 sets and two exercises?
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Yes you need more compounds exercises than isolation. But your routine isn't that bad, even with the routine that you posted at the beginning, you could still make some progress.
The most important thing is FOOD. EAT! EAT! EAT!.
Your diet is the most important thing, the workout is the second most important thing.
If you don't eat enough, you won't make gains, simple as that.
Instead of concentrating on the routine so much, you need to make a diet. , your diet should be your priority.
Eat every 2-3 hours, around 5-7 meals per day.
Include protein and complex carbs in every meal.
Include veggies and fruit in your diet.
Include some good fats in your diet.
Be sure to get 1 gram of protein per lb, so if you weight 150 lb you need 150 grams of protein.
The other people who replied to your post gave you some good ideas about your routine. But you really need to concentrate on the diet.
12 out of 17 of your exercises are isolation. Not that isolation is bad, because if you cant lift heavy in your compounds, isolation may be the way to go to get those numbers up. However Im not talking about arm work.
Take a look at your bicep, now take a look at your hamstring. Then look at your back. Which muscles are larger?
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The hamstring and back correct. To gain any type of size, you need to stimulate the largest muscles of your body. Glutes, quads, hammies, pecs, and back. Figure out how to work those muscles first, the arm growth will follow.
You need to eat to gain size. You wont go anywhere in the weight gain department not eating enough. I lift heavy no matter the goal, losing or gaining. Weight training is not a miracle activity that just adds muscle, as you've witnessed.
Finally how are you limited by dumbells? I dont see any limitations when you have a pair of adjustable dumbells.